Method of gas cutting a bevelled edge

ABSTRACT

A tip for an industrial gas cutting torch is disclosed comprising an elongated hollow shell element having a cone element mounted therein. The lower end of the cone element terminates inside and adjacent the lower end of the hollow shell. The lower ends of the shell element and the cone element dwell in an oblique plane with respect to the longitudinal axis of the shell element to facilitate the making of a bevel cut on a sheet of material. The method of using the tip is also disclosed.

United States Patent Etter Aug. 5, 1975 METHOD OF GAS CUTTING A BEVELLEDEDGE (76] Inventor: Berwyn E. Etter, Treasure Island,

Fla.

[22) Filed: May 6, 1974 [2|] Appl No.: 466,994

Related US. Application Data [62] Division of Ser, No 263268 June 151972 Pat. No.

[52] US. Cl. 148/9 R; 266/23 T [51] Int. Cl 823k 7/00 [58] Field ofSearch 148/9, 9 C, 95; 266/23 T [56] References Cited UNITED STATESPATENTS 2,266.834 12/l94l Walker et al. .i l48/95 Primary ExaminerW.Stallard Altorney, Agent, or Firm-Zarley, McKee, Thomte & Voorhees [57]ABSTRACT A tip for an industrial gas cutting torch is disclosedcomprising an elongated hollow shell element having a cone elementmounted therein. The lower end of the cone element terminates inside andadjacent the lower end of the hollow shell. The lower 'ends of the shellelement and the cone element dwell in an oblique plane with respect tothe longitudinal axis of the shell element to facilitate the making of abevel cut on a sheet of material. The method of using the tip is alsodisclosed.

1 Claim, 4 Drawing Figures METHOD OF GAS CUTTING A BEVELLEI) EDGE Thisis a divisional application divided from copcnding application Ser. No.263,268, filed June I972, now US. Pat. No. 3.8383519.

Conventional tips for cutting torches ordinarily taper from their baseend to the tip end thereof. The flame at the tip end is disposedgenerally parallel to the longitudinal axis of the body ofthe tip. lfabevel is to be cut in a sheet or plate. the tip is ordinarily maintainedin an inclined relationship with respect to the sheet so that the llanieis disposed at the angle of the desired bevel. In such an attitude, theflame tends to bounce off the sheet which substantially reduces theefficiency of the cutting action.

Therefore, it is a principal object of this invention to provide animproved tip for an industrial gas cutting torch.

A further object of this invention is to provide a tip for an industrialgas cutting torch which is designed so as to form a bevel in thematerial being cut.

A further object of this invention is to provide a tip for an industrialgas cutting torch which is efficient.

A further object of this invention is to provide a tip for an industrialgas cutting torch having means thereon for retaining the inner coneelement in the outer shell element.

A further object of this invention is to provide a tip for an industrialgas cutting torch wherein the lower ends of the inner cone element andthe outer shell element dwell in a plane which is oblique to thelongitudinal axis of the cone and shell elements.

A further object of this invention is to provide a tip for an industrialgas cutting torch which is economical of manufacture, durable in use andrefined in appearance.

These and other objects will be apparent to those skilled in the art.

This invention consists in the construction, arrangements, andcombination of the various parts of the device. whereby the objectscontemplated are attained as hereinafter more fully set forth,specifically pointed out in the claims. and illustrated in theaccompanying drawings in which:

FIG. I is a side view of the tip as it would be disposed when forming abevel in a sheet member:

FlG. 2 is an exploded perspective view of the tip of this invention:

FIG. 3 is a longitudinal sectional view of the tip; and

FIG. 4 is a sectional view seen along lines 4-4 of FIG. 3.

The tip of this invention is referred to generally by the referencenumeral I0 while the numeral I2 refers to the head portion of aconventional cutting torch. Tip It is maintained on the head 12 by nut14. Head 12 has a bore 16 formed therein which would be in communicationwith a source of oxygen. A plurality of bores 18 are formed in head 12and would be in communication with a source of an oxygen and industrialgas mixture. As seen in FIG. 3. head 12 has a lower end 20 with a recess22 formed therein. Recess 22 is in communication with the bore I6 andthe bores 18.

Tip It) comprises an elongated hollow shell element 26 including anoutwardly extending flange 28 at the upper end thereof. Bore 30 extendsthrough the shell element 26 for receiving the cone element 32 thereinas will l e explained in more detail hereinafter. In general, shellelement 26 includes an upper body portion 33 and a lower body portion 34which tapers inwardly with respect to the upper body portion 33. Thelower end 36 of the shell element 34 dwells in a plane which is obliqueto the longitudinal axis of the shell element 26 as illustrated in FIG.3. Opening 38 is formed in the lower end 36 as also seen in FIG. 3.Shell element 26 is provided with a shoulder 39 in its upper end (FIG.2]

Cone element 32 includes an upper body portion 40 and a lower bodyportion 42 which tapers inwardly from the lower end of upper bodyportion 40 as viewed in FIG. 2. A plurality of elongated grooves 44 areformed in the lower body portion of the cone element 32 and extend tothe lower end 46 ofthe cone element 32. As seen in FIG. 3, the lower endof cone element 32 dwells in a plane which is oblique to thelongitudinal axis of the cone element 32. The lower ends of the elements26 and 32 are parallel. Cone element 42 is provided with reduceddiameter portions 48 and 50 at its upper end defined by shoulders 52 and54.

The numeral 56 refers to a retainer including a ring portion 58 which isadapted to embrace upper body portion 33 of shell element 26 as seen inFIG. 3. A spring clip 60 extends downwardly from ringe portion 58 and isadapted to yieldably engage the interior surface of the shell element 26to maintain the cone element 32 therein when the tip 10 is removed fromthe torch. Seal 62 embraces reduced diameter portion 50. Disc 64embraces seal 62 and reduced diameter portion 48.

Assuming that the cone element 32 is inserted into the shell element 26,the tip is secured to the head 12 by simply extending the shell element26 through the opening formed in the nut 14 until the flange 28 engagesthe annular shoulder 66 in the nut I4. The upper end of disc 64 isgenerally triangular in shape as seen in FIG. 4. Disc 64 has a centralopening 66 which receives the seal 62 and reduced diameter portion 48.The nut I4 is then threadably secured to head 12 as illustrated in FIG.3. Tightening of the nut 14 draws the seal 62 into sealing engagementwith the head l2 around the bore 16 to prevent escape of oxygen as itpasses from bore 16 to the bore 68 in cone element 32. Tightening of thenut 14 also causes the disc 64 to engage the recess 32 of the head I2 asseen in FIG. 3. FIG. 3 depicts the fact that the outside diameter of theupper body portion 40 of cone element 32 is slightly less than theinside diameter of the upper body portion 33 of the shell element 26 soas to define a chamber or compartment area 70 therebetween. Bores l8communicate with the area 70 between the lobes 72 of the disc 64. Theexterior surface of lower body portion 42 of cone element 32 engages theinner surface of lower body portion 34 of shell element 26. The grooves44 permit the flow of the oxygen industrial gas flow therebetween.

In operation. the tip 10 would be oriented with respect to the plate orsheet material 74 as viewed in FIG. I. The tip 10 could either bemounted on a hand cutting torch or a machine mounted cutting torch asdesired. If a bevel is to be formed in the member 74, the tip I0 isoriented so that the longitudinal axis thereof is disposed in thedirection of the bevel cut and so that the lower end of the tip is in aplane parallel to the flat surface of the member to be cut. The lowerends of the shell element 26 and the cone element 32 dwell in an obliqueplane with respect to the longitudinal axis of the tip to facilitate themaking of a bevel cut in the member 74. The oxygen and gas mixture issupplied to the end of the tip by way of bores 18. between the lobes 72of disc 64, compartment area 70 and grooves 44. Cutting oxygen isfurnished to the end of the tip through the bore 16 and bore 68. Thus,the cutting oxygen is supplied to the center of the tip with theoxygengas mixture being supplied around the periphery of the lower endof the bore 68. The valve means for supplying the oxygen and gas to thetip has not been shown but is conventional in nature.

The tip 10 performs the bevel cutting action much more efficiently thanthe prior conventional devices. it has been found that a bevel cut canbe formed in a 1 inch steel plate at the rate of approximately 14 inchesper minute as compared to the 8 inches to 9 inches per minute heretoforepossible with existing tips. The tip 10 results in an approximate 30 to40 percent increase in cutting efficiency due to the relationship of thelongitudinal axis thereof with respect to the surface being cut and dueto the fact that the lower end of the tip dwells in a plane parallel tothe surface of the member being cut.

While the tip 10 has been described as comprising a shell element 26 anda cone element 32. it should be understood that the tip 10 could beformed from a single member. When shell element 26 and cone element 32are employed, the retainer 56 prevents their inadvertent separation whenthe tip I0 is removed from the torch.

Thus it can be seen that an improved tip has been provided for anindustrial gas cutting torch.

l claim:

1. The method of cutting a beveled edge on a sheet of flat material witha cutting torch means including a cutting tip having a longitudinalaxis. comprising.

holding the cutting tip so that its longitudinal axis is positioned withrespect to said plate in the direction of said bevel cut,

and maintaining the exterior end of said cutting tip in a plane parallelto the flat surface of the material to be cut.

1. THE METHOD OF CUTTING A BEVELED EDGE ON A SHEET OF FLAT MATERIAL WITHA CUTTING TORCH MEANS INCLUDING A CUTTING TIP HAVING A LONGITUDINALAXIS, COMPRISING, HOLDING THE CUTTING TIP SO THAT ITS LONGITUDINAL AXISIS POSITIONED WITH RESPECT TO SAID PLATE IN THE DIRECTION OF SAID BEVELCUT,